List of top Biology Questions

Differentiate between Net primary productivity and Gross primary productivity in an ecosystem.
Study the cross given below:
abnormalities ‘1’ and ‘2’ in the offsprings of a cross done between a couple
Identify the abnormalities ‘1’ and ‘2’ in the offsprings of a cross done between a couple and distinguish between them.
Name an alcoholic drink which is produced with the help of microbes:
(1) With distillation
(2) Without distillation
Analyse the following ecosystems and discuss, which will be more productive in terms of primary productivity:
A young forest, a natural old forest, a shallow polluted lake.
How are morphine and heroin related? Mention their effect on the human body.
Assertion (A): When the two genes in a dihybrid cross are situated on the same chromosome, the proportion of parental gene combinations is much higher than non-parental type.
Reason (R): Higher parental gene combinations can be attributed to crossing over between two genes.
Assertion (A): A bioreactor provides the optimal conditions for achieving the desired product by providing optimum growth conditions.
Reason (R): The most commonly used bioreactors are of stirring type.
How many pollen grains and ovules are likely to be formed in the anther and ovary of an angiosperm bearing 50 microspore mother cells and 50 megaspore mother cells respectively?
Evolution of modern man involves the following man-like primates. Choose the correct series of human evolution:
Assertion (A): Saheli is the World’s first non-steroidal oral contraceptive pill.
Reason (R): It has been developed by National Institute of Immunology, New Delhi.
Assertion (A): One of the properties of genetic code is degeneracy.
Reason (R): Some amino acids can be coded by more than one codon.
RNA interference (RNAi) helps in making tobacco-plant resistant to a nematode (\textit{Meloidogyne incognita}). Choose the correct option that shows how RNAi is achieved:
The sequence of nitrogenous bases in a segment of a coding strand of DNA is
5' – AATGCTAGGCAC – 3'.
Choose the option that shows the correct sequence of nitrogenous bases in the mRNA transcribed by the DNA.
Match the following items of Column-I with that of Column-II:
Column-IColumn-II
(a) Trophoblast(iv) Outer layer of blastocyst
(b) Implantation(i) Embedding of blastocyst in the endometrium
(c) Inner cell mass(ii) Group of cells that would differentiate as embryo
(d) Morula(iii) Embryo with 8–16 blastomeres
Choose the option that matches Column-I with Column-II correctly:
Match the items in Column-A with that of Column-B:
Choose the option that matches the items of Column A with that of B correctly:
The process of mineralization by microorganisms helps in the release of:
Amplification of gene of interest by using DNA polymerase may go up to:
Transplantation of tissues/organs to some patients often fails due to rejection by the body of the patient. Which type of immune response is responsible for such rejections?
Identify the labelled parts P, Q, R, and S in the stages of a dicot embryo shown in the diagram.
stages of a dicot embryo
Choose the option that indicates correct labelling of 'P', 'Q', 'R', and 'S' of embryo in differenct stages of its development.
GEAC stands for
A man whose father was colour-blind marries a woman who had a colour-blind mother and normal father. What percentage of male children of this couple will be colour-blind?

A child with blood group A has father with blood group B and the mother with blood group AB. Choose the option that gives the correct genotypes of father, mother, and the child:

A child with blood group A has father with blood group B

What is Microalbuminuria ?

Which of the following elements is essential for the synthesis of chlorophyll?

Which of the following is a pioneer species in primary succession on rocks?